Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Question
Chapter 4, Problem 11RQ
To determine
The size of the overload heater that should be used to protect the motor.
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Question 5
The blower requires 20 kW to run at 350 rpm. The power is
transmitted by a v-belt shown in Figure 4 from an electric motor. The
diameter of the machine pulley is 650 mm and that of the motor
pulley is 330 mm. The centre distance between the pulleys is 1.2 m.
The contact angle of the belt is 150°. The safe pull in each belt is
900 N and the mass of the belt is 0.46 kg per meter length. The
coefficient of friction between the belt and the pulley is 0.25. The
belt should not exceed the speed of 1 800 m/min.
X1 = 16 mm
H= 6 mm
B
X2 = 7 mm
Figure 4: Cross sectional view of the v-belt
5.1. Calculate the velocity of the belt in m/s.
Determine the length of the belt.
Calculate the belt tensions.
5.2.
5.3.
Chapter 4 Solutions
Understanding Motor Controls
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A three-phase motor nameplate indicates a full load current of 362 amperes. The nameplate indicates that the heaters are to be sized for 125% of motor full load current. Current transformers with a ratio of 600:5 are used to reduce the motor current. Using the chart shown in Figure 4–7B, determine the size of overload heaters needed to protect this motor.arrow_forwardA large motor has a full load current rating of 425 amperes. Current transformers with a ratio of 600:5 are used to reduce the current to the overload heaters. What should be the full load current rating of the overload heaters?arrow_forwardName three factors that determine the amount of induced voltage.arrow_forward
- The motor nameplate of a wye-delta started motor has a full load current of 287 amperes. What current rating should be used to determine the proper overload heater size?arrow_forwardA 480-volt three-phase load is rated at 34.5 kVA. It is to be supplied with variable three-phase voltage. Because the load is continuous, the transformers ratings are to be increased by 1.25% of the rated load. Three variable autotransformers are used to supply this load. Refer to Table 4-2 and determine the standard size of each transformer that should be used to make this connection.arrow_forwardPower-consuming devices are wired in _____(series orparallel).arrow_forward
- Refer to the transformer shown in Figure 5-13 to answer the following questions. The transformer shown in Figure 5-13 is supplying 325 volt amperes to a load. The primary voltage is 240 volts. What is the primary current? Figure 5-13 Autotransformer practice problems.arrow_forwardRefer to Figure 211 to answer the following questions. How much voltage will be applied to coil 1CR when it is energized?arrow_forwardWhat two factors determine the amount of voltage produced by a thermocouple?arrow_forward
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